Protective film for windshield of vehicle

Abstract

The present invention relates to a protective film for a windshield of a vehicle, which can be installed on a curved portion of the windshield of the vehicle without a thermoforming process, thereby improving the workability of a worker, and improving impact resistance to effectively protect the windshield of the vehicle.

What is claimed is: 
     
       1. A protective film for a windshield of a vehicle, the protective film comprising:
 an adhesive layer including an acrylic copolymer, a curing agent, and a solvent; 
 an elastic layer, disposed on the adhesive layer, including a polyurethane acrylate oligomer, an acrylate monomer, and a photoinitiator; and 
 a self-healing layer, disposed on the elastic layer, consisting of 100 parts by weight of a urethane resin and 30 to 50 parts by weight of an isocyanate curing agent, and having a function of healing scratches and impact resistance, 
 wherein the elastic layer having a thickness greater than a thickness of the self-healing layer is laminated between the self-healing layer and the adhesive layer, the elastic layer formed from a composition consisting of (i) 25 to 40 parts by weight of the polyurethane acrylate oligomer, (ii) 50 to 70 parts by weight of the acrylate monomer, and (iii) 0.1 to 5 parts by weight of the photoinitiator; 
 and wherein the protective film is attached to a curved portion of the windshield of the vehicle without a thermoforming process by an elastic force of the elastic layer. 
 
     
     
       2. The protective film of  claim 1 , wherein the adhesive layer includes 100 parts by weight of the acrylic copolymer, 0.1 to 5 parts by weight of the curing agent, and 90 to 110 parts by weight of the solvent. 
     
     
       3. The protective film of  claim 1 , wherein the elastic layer has a thickness of 100 to 200 micrometers, the self-healing layer has a thickness of 20 to 40 micrometers, and the adhesive layer has a thickness of 5 to 15 micrometers. 
     
     
       4. The protective film of  claim 1 , wherein the protective film has impact resistance characteristics of 2000 mJ or more based on a Du pont impact test. 
     
     
       5. The protective film of  claim 1 , further comprising:
 a primer layer disposed at one or more positions between the elastic layer and the self-healing layer, and between the elastic layer and the adhesive layer, and including a urethane resin and an isocyanate curing agent. 
 
     
     
       6. The protective film of  claim 5 , wherein the primer layer includes 100 parts by weight of the urethane resin, and 1 to 10 parts by weight of the isocyanate curing agent. 
     
     
       7. The protective film of  claim 6 , wherein the primer layer further includes at least one of a UV blocking agent and an IR blocking agent. 
     
     
       8. The protective film of  claim 1 , wherein at least one of the adhesive layer, the elastic layer, and the self-healing layer further includes at least one of a UV blocking agent and an IR blocking agent.